Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Shaping or consolidating
Patent
1993-04-21
2000-04-18
Fiorilla, Christopher A.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Shaping or consolidating
505492, 264614, H01L 3900
Patent
active
060515341
ABSTRACT:
A process for producing the 2223 phase of (Pb,Bi)SrCaCuO that is much faster than existing processes has the steps of: calcining a precursor powder mixture while maintaining intimate mixing of this precursor mixture by intermediate grindings during calcination; compressing the calcination product into a consolidated body; and heating the calcination product while maintaining intimate mixing of the calcination product, to form essentially phase pure 2223 (Pb,Bi)SrCaCu). A fast process for making a (Pb,Bi)SrCaCuO part with a high J.sub.c has the steps of: pressing calcined and reacted (Pb,Bi)SrCaCuO powder into a green body having the shaped of the part; and sintering the green body for a selected time, most preferably between 6 and 8 hours, that is long enough to establish superconducting electrical contact between grains of (Pb,Bi)SrCaCuO but short enough to prevent void formation or part shape distortion. The part made by this process has a high density, at least about 4 or 5 g/cm.sup.3.
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Bender Barry A.
Lawrence Steven H.
Rayne Roy
Toth Louis E.
Fiorilla Christopher A.
Karasek John J.
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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